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3.7.1 Calibrating compass
If the compass is not calibrated, you are prompted to calibrate the
compass when you enter the compass display.
If you want to re-calibrate the compass, you can start the
calibration again from the settings under Navigation » Calibrate
compass.
3.7.2 Setting declination
To ensure correct compass readings, set an accurate declination
value.
Paper maps point to true north. Compasses, however, point to
magnetic north – a region above the Earth where the Earth's
magnetic fields pull. Because magnetic North and true North are
not at the same location, you must set the declination on your
compass. The angle in between magnetic and true north is your
declination.
The declination value appears on most maps. The location of
magnetic north changes yearly, so the most accurate and up-to-date
declination value can be found from websites such as
www.magnetic-declination.com).
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